Mains/Line Voltage Change; Calibration And Test Instructions - Hameg HM8001-2 Benutzerhandbuch

Mains/Line Voltage Change

On delivery, the instrument is set to AC 230 V mains/
line voltage. The instrument has an appliance inlet
at the rear. This device contains the power fuse,
which is interchangeable for the different mains/
line voltages. The fuse holder can be pulled out by
means of a small screwdriver (after disconnection of
the power cord from the appliance inlet). Change the
power voltage by switching over the voltage selector
switch. The fuse holder should then be plugged in
again in the desired position.
The power fuse has to match to the set of the mains/
line voltage and must be changed if necessary. Make
sure that only fuses with the required rated current
and­of­the­specified­type­are­used­for­replacement.­
It is forbidden to repair defective fuses
or to bridge them by no means. Any
damage caused this way will void the
warranty.
Required power fuse-link:
5x20mm, slow-blow, 250V~, C, to IEC 127/III;
DIN 41662.
Mains/line voltage
115 V~ ±10%:
230 V~ ±10%:

Calibration and Test Instructions

Remove case to calibrate and test the instrument.
All voltages for operating the modules are sup-
plied from the multipoint connector contacts in
the individual module compart ments. The easiest
Rear panel
Signal In-/Outputs
1
for the right module
compartment
(Option HO801)
Rated current
T 2 A
T 1 A
Mains/Line
Voltage Input
and fuse
O p e r a t i n g t h e H M 8 0 0 1 - 2
way of testing is by measuring them on inserted
high power consumption modules (e.g. HM8030
or HM8035). However, high power consump tion
can also be simulated using resistors with the
following values:
for 2 x 5 V
DC
for 4 x 20 V
DC
To avoid damaging of the multipoint connector
contacts, the resistors should be linked to a
corresponding 22 pole connector, onto which the
required­1.3­kΩ­resistors­and­the­four­appropriate­
wire connectors can be soldered for programming
the 4 x 20 V potential. The diagram (page 18) shows
the values assigned to the multipoint connector
contacts.
The accuracy of the DC voltages is partly depen-
dent on the reference voltage setting and the
tolerance of the resistors used for programming.
With the 1% accuracy set during manufacture and
when using 1% resistors, the max. error is not
more than 2%. Variations of the mains/line voltage
of ±10% should not affect the supply voltages by
more than 0.5%. The highest tolerable hum and
noise level is max. 3 mV
least 0.1% accuracy should be used for all measu-
rements. These should be connected directly to
the multipoint connector contacts, as otherwise
voltage­drops­could­influence­the­test­results.
If­the­specified­tolerances­are­not­met,­the­cause­
must be located and recalibration of the reference
voltages may possibly be necessary.
Mains/Line
Voltage selector
Subject to change without notice
­=­2­x­­ 5­Ω,­­ 5­Watts
­=­4­x­40­Ω,­10­Watts
. Only voltmeters with at
pp
Signal In-/Outputs
for the left module com-
partment
(Option HO801)
17